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[ARM] Provide dummy noncoherent DMA API 

We don't currently support the noncoherent DMA API, but it needs to
be provided for kernels with devres to link.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-02-12 19:26:05 +00:00 committed by Russell King
parent 017cc022b6
commit f454aa6b90
1 changed files with 16 additions and 0 deletions
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16
include/asm-arm/dma-mapping.h
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@ -61,6 +61,22 @@ static inline int dma_mapping_error(dma_addr_t dma_addr)
return dma_addr == ~0;
}
/*
* Dummy noncoherent implementation. We don't provide a dma_cache_sync
* function so drivers using this API are highlighted with build warnings.
*/
static inline void *
dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
{
return NULL;
}
static inline void
dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t handle)
{
}
/**
* dma_alloc_coherent - allocate consistent memory for DMA
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices